Abstract: Vertical packaging machine for packages such as boxes, bags and similar, comprising a closed path along which gripping means arc movable to grasp and carry the packages, means for feeding products to the machine and dosing means to direct a predetermined amount of product to said packages, characterized by further comprising at least one plurality of product feeding containers. The containers are disposed above a corresponding plurality of gripping means of the packages and are movable along one or more guides to follow at least part of the path of the gripping means and packages present on the gripping means. The containers are assembled on means sliding inside said guides and they arc composed of several portions and the position of said portions can be adjusted by the machine to change the dimensions of said containers.